Oil motor



July 17, 1956 FEROY 2,754,766

OIL MOTOR Filed Aug. 26, 1953 INVENTOR. AIZNE FEIEOY BY 8M SW A TTO/ZNEY United States Patent OIL MOTOR Arne Feroy, Kent, Wash. Application August 26, 1953, Serial No. 376,648

3 Claims. (Cl. 103-136) This invention relates to oil motors and pumps of the balanced vane class. The principal object of the invention is to provide simple and positive means for insuring proper movement of the vanes.

In oil pumps and motors of the balanced vane class, it is necessary that the vanes follow the contour of the rotor chamber at all times, yet the forces acting on the vanes are sometimes insuflicient to make the vanes slide out of their slots in the rotor fast enough to maintain the contact of the vanes with the chamber wall. This difficulty is especially troublesome in oil motors of this class. An object of this invention is to provide a pair of toothed plates operably engaging shoulders of the vanes, in such a vane motor or pump, the plates driven by the vanes at a differential speed which enables the teeth on the plates to cooperate with the walls of the pump chamber in a manner which insures the proper movement of the vanes, maintaining them at all times in close proximity with the chamber walls.

Other objects are to provide an oil pump or motor of simple and durable construction, operable with balanced pressures, and of few and simple parts of easy manufacture.

These and other objects of the invention will be apparent from the following specification in connection with the drawings, in which:

Fig. 1 is a longitudinal sectional view; and

Fig. 2 is an end view partly in section on the line 2-2 of Fig. 1.

Referring to the drawings, the casing of the oil motor or pump consists of end plates and shell 11, the three parts held together by bolts 12. Shell 11 contains the pumping chamber with its wall 15.

Pump shaft 20 is mounted in journal bearings 19 in end plates 10. Rotor 21, integral with pump shaft 20, has slots 22 operably receiving vanes 23. At each end of rotor 21 is a toothed plate 24, the teeth engaging shoulders 25 of vanes 23.

The number of teeth on each toothed plate 24 is different from the number of vanes 23, the difierential serving, in conjunction with the pumping chamber walls 15, to cause the plates 24 to rotate at a different speed from that of rotor 21. In the embodiment shown, there are six pairs of vanes 23 and each plate 24 has five pairs of teeth; in this case plates 24 will rotate at six-fifths the speed of rotor 21.

In operation, oil flows into and out of the motor or ice pump in a well-known manner. Vancs 23 coact with toothed plates 24 to cause the latter to run at a differential speed relative to that of rotor 21. The teeth of plates 24 are shaped to coact with the shoulders 25 of vanes 23, to cause vanes 23 always to remain in close proximity with the pumping chamber wall 15 in shell 11. In one pair of diametrically opposite quadrants the vanes 23 drive plates 24; in the other pair of diametrically opposite quadrants plates 24 drive vanes 23.

Having thus described the invention, it is obvious that the objects as stated have been attained in a simple and practical manner. While a specific embodiment of the invention has been shown and described, it is understood that changes may be made in the construction and arrangement of the various parts without departing from the spirit or scope of the invention as set forth in the following claims.

I claim:

1. In an oil motor, a casing, an oval chamber in said casing, a cylindrical rotor coaxially operable in said casing, substantially radial slots in said rotor, vanes operable in said slots, and a pair of toothed plates free to rotate coaxially with said rotor and Within said casing, the number of teeth on each plate being different from the number of said slots and vanes, said teeth coacting with said vanes to drive said plates at a different speed from that of said rotor and to keep said vanes in running contact with the periphery of said oval chamber.

2. In an oil pump, a casing, an oval chamber in said casing, a cylindrical rotor coaxially operable in said casing, a number of pairs of diametrically opposite slots in said rotor, vanes operable in said slots, a pair of shoulders on each vane, and toothed plates free to rotate coaxially with said rotor and within said casing, the number of teeth on each plate being difierent from the number of said vanes, said teeth coacting with said shoulders to drive said plates at a difierent speed from that of said rotor and to keep said vanes in running contact with the oval wall of said chamber.

3. In an oil motor of the balanced vane class, a casing, an oval chamber in said casing, a pair of toothed plates free to rotate coaxially within said chamber, a cylindrical rotor between said plates and coaxially operable in said casing, a number of substantially radial slots in said rotor, the number of said slots being different by two from the number of teeth on said toothed plates, said teeth coacting with said vanes with a Vernier action to drive said plates at a different speed from that of said rotor and to keep said vanes in running contact with the oval wall of said chamber.

References Cited in the file of this patent UNITED STATES PATENTS 556,721 Briggs Mar. 17, 1896 991,314 Humphreys May 2, 1911 1,922,797 Eyston Aug. 15, 1933 2,099,193 Brightwell Nov. 16, 1937 2,317,708 Wilson et al. Nov. 22, 1938 FOREIGN PATENTS 600,266 France Nov. 4, 1925 

